This local emblem is the oldest and largest dragon tree in the Canary Islands.

This unique rock formation is quite the local celebrity, although one day it may come crashing down.

On La Gomera, "Silbadors" communicate in a 4,000-word language of whistles.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

A temple to modernity, tucked away amid Barcelona's more well known museums.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

A hidden three-foot-wide house separates these two regal churches.

The medieval castle built as headquarters for the Pope's secretive Knights Templar.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

This curious, round temple is the oldest still-standing marble building in Rome.

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

This large, circular tomb is the final resting place of the first emperor of Rome.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

The underground sanctuary of a mysterious ancient cult.

2300-year-old Roman road connecting the empire.